Electric-lamp socket.



N0. 798,932. l PTBNTED SEPT. 5, `1905. G. B. THOMAS. ELECTRIC LAMPSOCKET.

APPLICATION FILED MAB-6,1905.

Fzgb` v INVENTOR /fama/-f ATTORNEYS WITNESSES r 7%. ci m UNITED STATESPATENT OFFICE.

GEORGE B. TIIOhIAS, OF RIDGEIOR'I, CONNECIICUI, ASSIGNOH TO II-IEBRYANI` ELECTRIC COMPANY, OF .BIIIXEIOR-'Il CONNECTICUT, A COR- PORATIONOF CONNECTICUT.

ELECTRIC-LAMP SOCKET.

No. 798,932. Specification of Letters Patent. Patented Sept.5, 1905.

.'iizplieatien filed March G, 1905. Serial No. 248,630.

1b n.7/ uffi/mt it muy conf/'rnc position shown, it makes contact with ater- Be it known that I,(111onol1 B.'l`ln' .\i.\s,a citiminal plate E toclose the circuit through the 55 Zen ot' the United Statesot' America,residing' plate (le, yoke d, and screw e to the plate C in the city ot'Bridgeport, in the county ot' s, and the lamp-lilament.

5 Fairlield, Stateoi' Connecticut, have invented The terminal plate E isof the form best an Improved Electric-Lamp Socket, ot' which shown 1nFigs. 3 and 5 and 1s secured to the the following' is a specification.rear Vtace ot the socket-body A by a screw n, 6C

Ny invention relates more particularly to which is inserted from withinthe chamber (i thatclass ofelectric-iincandescent-lamp sockets .I beforethe threaded shell B is put in place and i0 which are known asall-porcelain sockets E soas tobe freeol'contact\\ithsuch shell. The andare without the outer metallic shell and plate E has one arm .f/projecting'across the rear cap en'iployed in the large majority ot'sockets open chamber I.) Vt'or the action ot' the switch- 65 incommercial use. tumbler, while the other arm e2 carries a bind- Theobject ot' my invention is to provide a ing-screw c to receive the baredend ot the l5 simple, strong, and el'iicient socket,particuconducting-wire. The other terminal plate F, larly of' theall-porcelain type. which carriesalikebinding-screwj" to receive In theaccompanying` (.lrawings, Figure l is the endot'theothercondnoting-wire, is secured 70 a vertical section through oneot'my improved to the back ot' the body A ot' the socket by a sockets otthe key type on the line I l, Fig'. screwf, passed from the inside 0i'the cham- 20 Fig'. 2 isa similarsection on the line 2 Q, Fig. 3. ber u,but being' in electrical connection with Fig. l) is a plan view ol' thebody ot' the socket the threaded lamp-terminal B. This screw]L1 with thecap removed. Fig. i is a view of may, in fact, aid in mechanicallyholding' the 75 the inner face ol' the cap. Fig'. 5 is a pershell I3 inplace by passing' through the inspective view of one ot' the terminalplates. wardly-turned flange at the base of the shell 15 Fig'. 6 is avertical section through a socket I, as shown in Fig'. l. I prefer,however', to ot' the keyless type. Fig. 7 is an enlarged rely uponscrews Cf Gr, Fig'. 2, which are not View of one of the cap-retaining'screws, and in the electrical circuit, to mechanically hold 8O Figs. 8and 9 are views illustratingadetail in the shell B, these screwspassing' vertically l connection with this screw. through the body ot'the insulation and being ;O Referring' to l, Q, and 3, the body Athrcadedinto brackets I'II'Lwhich areplacedin of the socket may be madeof porcelain or pockets /M/,formed in theinsnlation, asshown othersuitable insulating' material, and at its in Fig'. 2. Into the upperends of these same 85 inner end it is formed with a cup-shaped bracketsare threaded the screws K K, which chamber if to receive thesocket-terminals for pass through opening's in the porcelain cap J, thelamp. .In the drawings I have shown and when the parts are put togetherthese these terminals oi' the Edison typehnamely, a screws hold the capin place. By unscrewing screw-tin'eaded shell B and central terminal C,these screws from the brackets H H the cap this latter being' shown inthe present instance can be lit'tcd from the body A or the latter can asa bent spring-plate secured by a central be withdrawn from the cap toget at the con- LO headed screw e. This latter passes through a nectionof the wires with the terminal plates central opening' in the bottom ofthe c-hamber E and F. I prefer to clamp under the plate A and projectsinto a rear chamber D, open to F a sheet of mica fm, Figs. l and 3,which pro- 95 the rear end of the socket-body A. In the jects over thearm e' ot' the terminal Eto prekey type otl socket this chamber Dreceives vent short-eircuiting' by the free ends of the L5 the switch S,conductors. This arm e is oi'set, as shown in Any suitable form ot'switch may be em- Fig's. l, 2, and 3, (see also modilication, Fig.ployed; but in the drawings I have shown the 6,) to permit the micasheet to lie over it. IOO

Perkins form ot' switch (Patent No. 626,927) In Order to prevent thecap-securing' screws with a tumbler having the key-stem Z/ pass- I(Afrom dropping' out of the cap and becom- :O ing` through it with lostmotion and acted on ing' lost when the cap is detached from the by aplate di, guided vertically by a yoke Z3 body A, I provide theconstruction which is and pressed upward by a spring' ([4. illustratedon an enlarged scale in Figs. 7, 8, 105

When the tumbler d is turned to the vertical and 9. Only the outer endof the screw is threaded, as at as shown in Fig. 7, and the neck or stemy back of the thread is made of smaller diameter than the threadedportion, and on this neck or stem I mount a split Washer Z. This isslipped onto the reduced neck or stem y when in the opened or horseshoeform (shown in Fig. 8) and after the screw K has .been put through itsopening in the cap. The

Fig. 6, I have also shown how in the keyless form of my socket theswitch is replaced by a Xed spacing-bracket M, through which passes anelongated screw c', whose upper end is threaded into a threaded hole inan arm .of the terminal plate E.

I claim as my inventionl. In an incandescent-lamp socket, thecombination of an insulating-body having at one end a chamber andterminals therein for the lamp-base, with a central chamber in the otheror rear face of the body, terminal plates on said rear face, one of saidterminal plates having an oifset arm projecting across said rearchamber, an insulating-sheet clamped under the other plate and lyingover said oifset arm, and an inclosing cap for said rear face.

Q. In an incandescent-lamp socket, the combination of aninsulating-bodyhaving at one end a chamber and terminals therein for the lamp-base,with terminal plates for the conductorf'wires on the other or rear faceof the body, two other chambers also in said rear face and brackets inthese latter chambers, in-

closing cap,screws passing through this cap I into the brackets, andscrews passing from the lamp-base terminal chamber into the brackets. Intestimony whereof I have signed my name to this specification in thepresence of two subscrilnin g witnesses.

GEORGE B. THOMAS. Witnesses:

G. W. GooDRIDGE, M. A. BARRY.

